Finding the Fourth Proportional to 3,915.89, 5,874.72 and 1,318.83

Step by Step Solution

1. Step 1: Write the proportion equation
   3,915.89 : 5,874.72 = 1,318.83 : x
2. Step 2: Convert to fraction form
   3,915.89/5,874.72 = 1,318.83/x
3. Step 3: Cross multiply
   3,915.89x = 5,874.72 × 1,318.83
4. Step 4: Simplify right side
   3,915.89x = 7,747,756.98
5. Step 5: Solve for x
   x = 7,747,756.98/3,915.89
6. Step 6: Final answer
   x = 1,978.54